Which of the following plant growth regulators (PGRs) promotes root initiation, flowering and
(a) Gibberellin (b) Auxin
(C) Cytokinin (d) Ethylene
(b) Auxins promote root initiation at a concentration which otherwise is inhibitory for growth of intact root. Auxins are often employed for inducing flowering in litchi and pineapple. Application of auxins to unpollinated pistils make them develop into seedless fruits or parthenocarps.